Question # 1

During oxidation in k₂Cr₂O_{7, Cr VI changes to :}

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I

II

III

IV

A compound possessingα-hydrogen atom, in the presence of dilute alkali formsβ-hydroxy aldehyde. This product on heating with dilute acid forms an unsaturated crotonaldehyde. The compound is

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CH₃CHO

CH₃CH₂CHO

CH₂= CH - CHO

HC = C - CHO

Charge to mass ratio of electron was discovered by:

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Millika.

Rutherford.

J.J. Thomson.

Chadwick.

Which of the following is a thermosetting plastic

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PVC

Polyethylene

Polystyrene

Melamines

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+712 KJ mol^-1

+492 KJ mol^-1

-932 KJ mol^-1

-960 KJ mol^-1

Which of the following is the hardest metal among following

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Li

Na

Rb

K

By the use of catalysis the energy of activation is

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Decreased

Increased

Not affected

None

Indicate the correct statement

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All lanthanidees are present in the same group

All halogens are present in the same period

All the alkali metals are present in the same group

All the noble gases are present int he same period

Monosaccharides and oligosacchradies are generally called as

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Crystals

Sugars

Liquids

Non-sugars

Amongst the following the compound that can be most readily sulphonated is

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Toluene

Benzene

Nitrobenzene

Chlorobenzene

Which is not a calcareous material

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Lime

Clay

Marble

Marine shell

A cell constant is generally found by measuring the conductivity of aqueous solution of

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BaCl₂

KCl

NaCl

MgCl₂

I-Phenylethanol can be prepared by reaction of benzaldehyde with

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Methyl iodide an Magnesium

Methyl bromide

Methyl bromide and AIBr₃

C₂H₅l and Mg

Bohr model of atom is contradicted by:

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Planck's quantum theory

Pauli's exclusion theory

Heisenberg's uncertainty principle.

All of above.

When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:

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Alpha rays.

Negative particles.

Electromagnetic rays.

Positive particles.

95% alcohol is called

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Rectified spirit

Spirit of wine

Spirit

Methylated

The protection of steel by chrome plating is due to

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Cathodic protection

Anodic protection

Covering of steel surface

Formation of alloy with iron

Phosphine is not obtained by the reaction when

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White P is heated with NaOH

Red P is heated with NaOH

Ca₂P₂reacts with water

PH₄l is boiled with water

Electronic configuration of Cu⁺²is

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4S², 3d⁹

4s^-1, 3d¹⁰

4S⁰, 3d⁹

None of these

The color of ppts formed by Benedirct's test is

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Brick red

Wine red

Yellow

Orange

In exothermic reaction decrease in potential energy of the products will result in

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Decreases in kinetic energy of the particles

Increases in kinetic energy of the particles

No change in kinetic energy

Decreases in activation energy

Which of the following is a strong electrolyte?

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Ca(NO₃)₂

HCN

CH₃COOH

NH₄OH

Series starting form ₃₉Y to ₄₈CD is in period:

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4th

5th

6th

7th

In endothermic reactions, the heat content of the

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Products is more than that of reactants

Reactants is more than that of products

Both a and b

None of the above

Which compound will not dissolve in H₂O

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C₆H₆

C₂H₅OH

CH₃CH₂CH₂OH

CH₃- OH

How many cm³of 1 M H₂SO₄required to neutralize 10 cm³of 1 M NaOH

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2 cm³

2.5 cm³

5 cm³

10 cm³

K_bvalue of NH₄OH is 1.81 x 10^-5and its conjugate acid has K_a= 5.7 x 10^-10pKb of the base is 4.74, pKa of its conjugate acid is

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-4.74

4.74

10

9.26

Aldehydes and ketones are carbonyl compounds. Which of them react both with NaBH₄and with Tollen's reagent

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Both aldehydes and ketones

Aldehydes only

Ketones only

Neither aldehydes nor ketones

Eletronegativity difference in C-C bond in alkanes is:

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Zero

Double

Half

4.0

Which of the following does not reflect the periodicity of elements?

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Bonding behaviour

Electronegativity

Ionisation potential

Neutral/proton ratio

Formula of chloroform is:

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CH₃Cl

CCl₄

CH₂Cl₂

CHCl₃

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